When all magika comes from aitherius and the Aedra how do the deadra get magika for destruction spells and the like? My personal theory is that it is passed over to them by devout daedra worshippers willing to expend their own magika to give it to their masters, but I'd like to know if there's any actual lore on the subject. Also if the sun is a portal from mundus to aitherius (bypassing oblivion) how come we can see is in the shivering isles?